Internal-combustion engine



FIG. 1 is a left-front perspective view of an internal-combustion engine according to my new design;

FIG. 2 is a front view of an internal-combustion engine according to my new design;

FIG. 3 is a rear view of an internal-combustion engine according to my new design;

FIG. 4 is a left side view of an internal-combustion engine according to my new design;

FIG. 5 is a right side view of an internal-combustion engine according to my new design;

FIG. 6 is a top plan view of an internal-combustion engine according to my new design; and,

FIG. 7 is a bottom view of an internal-combustion engine according to my new design. 

The ornamental design for an internal-combustion engine, as shown and described. 